WO2023187982A1 - Corps d'électrode et élément de stockage d'énergie - Google Patents

Corps d'électrode et élément de stockage d'énergie Download PDF

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Publication number
WO2023187982A1
WO2023187982A1 PCT/JP2022/015440 JP2022015440W WO2023187982A1 WO 2023187982 A1 WO2023187982 A1 WO 2023187982A1 JP 2022015440 W JP2022015440 W JP 2022015440W WO 2023187982 A1 WO2023187982 A1 WO 2023187982A1
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Prior art keywords
region
electrode
electrode conductor
resistance
conductor
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PCT/JP2022/015440
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English (en)
Japanese (ja)
Inventor
航 加藤
和也 村本
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京セラ株式会社
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Priority to PCT/JP2022/015440 priority Critical patent/WO2023187982A1/fr
Publication of WO2023187982A1 publication Critical patent/WO2023187982A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to an electrode body and a power storage element including the electrode body.
  • Patent Document 1 discloses an example of an electrochemical cell.
  • the electrochemical cell includes (i) a first current collector coupled to a first portion of the pouch, and (ii) a second current collector coupled to a second portion of the pouch. Be prepared. A first electrode material is disposed on the first current collector. A second electrode material is disposed on the second current collector.
  • the electrochemical cell further includes a separator disposed between the first electrode material and the second electrode material.
  • An electrode body includes an active material layer including an electrode active material and an electrolyte, (i) a first region where the active material layer is located, and (ii) a region different from the first region.
  • an electrode conductor having a second region which is a region to which a connecting terminal can be electrically connected; a resistance portion that exhibits higher resistance than the first region with respect to movement of the electrolytic solution along the surface of the body on the side where the active material layer is located.
  • FIG. 1 is a perspective view showing the appearance of a secondary battery according to the present disclosure.
  • FIG. 1 is a perspective view showing the appearance of a unit cell according to the present disclosure.
  • FIG. 2 is an exploded model diagram showing a cross section taken along line III-III in FIG. 1;
  • FIG. 2 is an exploded model diagram showing a cross section taken along line IV-IV in FIG. 1;
  • FIG. 3 is a model diagram showing a specific structure of an electrode body.
  • FIG. 2 is a plan view showing a structure near an exposed portion of a negative electrode included in an electrode body according to the present disclosure.
  • FIG. 3 is a diagram showing movement of an electrolyte in an electrode conductor of a negative electrode that does not include a resistance portion.
  • FIG. 1 is a perspective view showing the appearance of a secondary battery according to the present disclosure.
  • FIG. 1 is a perspective view showing the appearance of a unit cell according to the present disclosure.
  • FIG. 2 is an exploded model diagram showing a cross section
  • FIG. 3 is a diagram showing an example of a cross section of an electrode conductor included in a negative electrode according to the present disclosure.
  • FIG. 7 is a cross-sectional view schematically showing a resistance section according to a first modification.
  • FIG. 7 is a cross-sectional view schematically showing a resistance section according to a second modification.
  • FIG. 7 is a plan view showing a modification of a unit cell including a negative electrode according to the present disclosure.
  • FIG. 1 is a perspective view showing the external appearance of the secondary battery 1.
  • the secondary battery 1 is a battery that can be charged or discharged by being electrically connected to an external terminal.
  • at least one secondary battery 1 may be installed in a power storage device for a home, a base station, a vehicle, a robot such as a drone, or a medical device.
  • the secondary battery 1 may include a unit cell 10 (power storage element), connection terminals 21 and 22, and a second container 50. The configuration of the unit cell 10 will be described later.
  • the second container 50 may accommodate the unit cell 10.
  • the second container 50 may be formed of, for example, an aluminum pouch film or a laminate film having a layer of metal foil such as stainless steel or nickel.
  • the aluminum pouch film may be one in which aluminum is vapor-deposited on a film, or one in which an aluminum foil and a film are laminated.
  • the material of the film may be, for example, polypropylene, polyethylene, nylon, or polyethylene terephthalate.
  • the thickness of the second container 50 may be greater than or equal to 50 ⁇ m and less than or equal to 300 ⁇ m, and may be, for example, 200 ⁇ m.
  • the second container 50 When the second container 50 is an aluminum pouch film, the second container 50 may have a configuration in which two aluminum pouch films are located on both sides of the unit cell 10 in the stacking direction (Z-axis direction). Further, when the second container 50 is an aluminum pouch film, the second container 50 may have a structure in which one aluminum pouch film is folded in half and the unit cell 10 is located inside the aluminum pouch film. .
  • connection terminals 21 and 22 may be terminals connected to external terminals in order to extract power from the secondary battery 1 or to supply power to the secondary battery 1.
  • the connection terminals 21 and 22 may protrude from the inside of the second container 50 to the outside.
  • the material of the connecting terminals 21 and 22 may be, for example, copper, aluminum, or nickel.
  • the thickness of the connecting terminals 21 and 22 may be greater than or equal to 50 ⁇ m and less than or equal to 500 ⁇ m, and may be, for example, 200 ⁇ m.
  • the connecting terminals 21 and 22 may be subjected to surface treatment to improve adhesiveness with an adhesive member (not shown).
  • the adhesive member adheres the connection terminals 21 and 22 and the second container 50 located above and below the connection terminals 21 and 22 in order to determine the positions of the connection terminals 21 and 22 with respect to the second container 50.
  • FIG. 2 is a perspective view showing the appearance of the unit cell 10.
  • the unit cell 10 may include an electrode body 14 and a first container 15 (container).
  • the electrode body 14 may have a sheet-like shape.
  • the sheet-like electrode body 14 may include a positive electrode 11 and a negative electrode 12.
  • the first housing body 15 may house the electrode body 14.
  • the first housing body 15 may have its peripheral edge sealed while housing the electrode body 14 therein.
  • the plurality of first containers 15 may be adhered to each other with an adhesive layer (not shown).
  • the material of the first container 15 may be, for example, a film of PET (polyethylene terephthalate) or nylon. More specifically, for example, the two first containers 15 may be located on both sides of the unit cell 10 in the stacking direction (Z-axis direction).
  • the thickness of the base material of the first container 15 may be, for example, 10 ⁇ m or more and 40 ⁇ m or less, and may be, for example, 25 ⁇ m.
  • the material of the adhesive layer may be, for example, polypropylene or polyethylene.
  • the first container 15 may be transparent, for example.
  • FIG. 2 is a diagram showing how the electrode body 14 can be confirmed through the first container 15 by using the transparent first container 15 in the unit cell 10.
  • the first container 15 may have a cutout 16.
  • the notch 16 may be provided in each of the first container 15 on the positive electrode 11 side and the first container 15 on the negative electrode 12 side.
  • gas generated by the decomposition reaction of the electrolyte or a small amount of water inside the unit cell 10 can be removed from the outside of the unit cell 10. It can be released to Further, by providing the notch 16, a part of the positive electrode 11 side and a part of the negative electrode 12 side may be exposed from the first container 15. Alternatively, a part of the positive electrode 11 side and a part of the negative electrode 12 side may not be exposed from the first container 15.
  • the internal space of the unit cell 10 on the positive electrode 11 side is connected to the external space of the unit cell 10
  • the internal space of the unit cell 10 on the negative electrode 12 side is connected to the external space of the unit cell 10. It may have a configuration in which it communicates with an external space. Furthermore, at the position of the notch 16 on the positive electrode 11 side, the first housing 15 on the negative electrode 12 side is exposed, and at the position of the notch 16 on the negative electrode 12 side, the first housing 15 on the positive electrode 11 side is exposed. may be exposed.
  • the positive electrode 11 may have an exposed portion 11e exposed from the first container 15.
  • the negative electrode 12 may have an exposed portion 12e exposed from the first container 15. Specifically, the exposed portions 11e and 12e protrude from the first container 15.
  • Connection terminals 21 and 22 may be electrically connected to exposed portions 11e and 12e, respectively, by ultrasonic welding, laser welding, or resistance welding, for example. Details of the positive electrode 11 and the negative electrode 12 will be described later.
  • the secondary battery 1 may have a configuration in which a unit cell 10 in which a positive electrode 11 and a negative electrode 12 are housed in a first housing body 15 is further housed in a second housing body 50. With this configuration, the electrode bodies 14 are housed in duplicate, so the safety of the secondary battery 1 can be improved. Moreover, you may accommodate the 2nd container 50 in a further container. However, the secondary battery 1 only needs to be one that includes the positive electrode 11 and the negative electrode 12, and only needs to be housed in at least one container.
  • the secondary battery 1 has a configuration in which a plurality of unit cells 10 are stacked, for example, a configuration in which ten layers of unit cells 10 are stacked.
  • the secondary battery 1 according to the present disclosure may include a plurality of unit cells 10 different from 10 layers, or may include only one layer.
  • the unit cells 10 may be stacked.
  • the portions excluding the connection terminals 21 and 22 may have a substantially rectangular shape or may have a different shape.
  • the portions excluding the exposed portions 11e and 12e may have a substantially rectangular shape or may have a different shape.
  • FIG. 3 is an exploded model diagram showing a cross section taken along line III-III in FIG. 1.
  • FIG. 4 is an exploded model diagram showing a cross section taken along line IV-IV in FIG. 1.
  • the second container 50 is omitted in FIGS. 3 and 4.
  • FIGS. 3 and 4 mainly show the positional relationship of each component. Therefore, the relationship in thickness of each component is not necessarily as shown in FIGS. 3 and 4.
  • the secondary battery 1 may further include a first protection member 30.
  • the first protection member 30 includes a first connection portion that electrically connects the exposed portions 11e exposed from the first housing body 15 of each unit cell 10, and an exposed portion exposed from the first housing body 15 of each unit cell 10.
  • a second connecting portion that electrically connects the portions 12e may be protected.
  • the exposed parts 11e and the exposed parts 12e may be connected to each other by, for example, ultrasonic welding, laser welding, or resistance welding.
  • the exposed portions 11e of the positive electrodes 11 and the exposed portions 12e of the negative electrodes 12 are not connected to each other, but they are actually connected as described above.
  • the material of the first protection member 30 may be, for example, a film-like polyolefin or polyimide.
  • the first protection member 30 may be adhered to the exposed portions 11e and 12e with an adhesive layer (not shown). Further, the material of the adhesive layer in the first protection member 30 may be any material as long as it is difficult to dissolve into the electrolytic solution (electrolyte).
  • the material of the adhesive layer may be, for example, an acrylic adhesive.
  • the first protection member 30 may cover a part of the first container 15 from the first connection part and the second connection part.
  • stress concentration can be made less likely to occur, thereby reducing the possibility that the exposed portion 11e or 12e will be damaged or broken in the vicinity of the first connection portion and the second connection portion.
  • the first protection member 30 only needs to protect at least the first connection part and the second connection part, and does not necessarily cover the first container 15 from the first connection part and the second connection part. It's okay.
  • the positive electrode 11 may include an electrode conductor 11a and a positive electrode active material layer 11b.
  • the negative electrode 12 may include an electrode conductor 12a and a negative electrode active material layer 12b.
  • the electrode conductor 11a may be, for example, aluminum foil.
  • the thickness of the electrode conductor 11a may be 5 ⁇ m or more and 25 ⁇ m or less, and may be, for example, 10 ⁇ m.
  • the electrode conductor 12a may be, for example, copper foil.
  • the thickness of the electrode conductor 12a may be 5 ⁇ m or more and 25 ⁇ m or less, and may be, for example, 10 ⁇ m.
  • FIG. 5 is a cross-sectional view showing the specific structure of the electrode body 14.
  • the positive electrode active material layer 11b (active material layer) may be a layer of a positive electrode material that is a mixture of a positive electrode active material 11c (electrode active material) and a conductive additive 11d.
  • the negative electrode active material layer 12b (active material layer) may be a layer of a negative electrode material that is a mixture of the negative electrode active material 12c (electrode active material) and the conductive additive 12d.
  • the positive electrode active material 11c may be, for example, lithium cobalt oxide, lithium nickel oxide, lithium iron phosphate, or lithium manganate.
  • the negative electrode active material 12c may be, for example, graphite or lithium titanate.
  • the conductive aids 11d and 12d may be carbon black or acetylene black, for example. However, the positive electrode active material 11c, the negative electrode active material 12c, and the conductive aids 11d and 12d are not limited to these.
  • the positive electrode material may have so-called clay-like properties in which an electrolytic solution is mixed into a mixture composed of the positive electrode active material 11c and the conductive additive 11d.
  • the negative electrode material may have so-called clay-like properties in which an electrolytic solution is mixed into a mixture composed of the negative electrode active material 12c and the conductive additive 12d.
  • the positive electrode 11 may be an electrode in which a positive electrode material is coated on the electrode conductor 11a.
  • the negative electrode 12 may be an electrode in which an electrode conductor 12a is coated with a negative electrode material.
  • the electrolytic solution is a solution of lithium salt, which is an electrolyte, in a non-aqueous solvent.
  • the nonaqueous solvent may be a carbonate solvent.
  • the carbonate solvent may be ⁇ -butyrolactone, ethylene carbonate, or both ⁇ -butyrolactone and ethylene carbonate. Further, as the carbonate solvent, as long as it contains at least either ⁇ -butyrolactone or ethylene carbonate, it may contain other solvents. Examples of other solvents include propylene carbonate, dimethyl carbonate, dimethoxyethane, diethyl carbonate, tetrahydrofuran, and triethylene glycol dimethyl ether.
  • the electrolyte may be lithium hexafluorophosphate or lithium bis(fluorosulfonyl)imide (LiFSI).
  • the electrode body 14 may further include a separator 13.
  • the positive electrode 11, the negative electrode 12, and the separator 13 may have a positional relationship such that the positive electrode active material layer 11b and the negative electrode active material layer 12b are in contact with the separator 13. That is, the unit cell 10 may have a structure in which the positive electrode 11 and the negative electrode 12 are stacked with the separator 13 in between.
  • the separator 13 may function as an insulating member that insulates the positive electrode 11 and the negative electrode 12.
  • a sheet-like nonwoven fabric or a porous material may be used.
  • a porous film made of a thermoplastic resin having a melting point of about 80° C. to 140° C. may be used.
  • the thermoplastic resin for example, polyolefin polymers such as polypropylene and polyethylene, or polyethylene terephthalate may be used.
  • FIG. 6 is a plan view showing the structure of the negative electrode 12 included in the electrode body 14 in the vicinity of the exposed portion 12e.
  • the negative electrode active material layer 12b is omitted in FIG.
  • the electrode conductor 12a has a first region 121 and a second region 122.
  • the first region 121 is a region where the negative electrode active material layer 12b is located.
  • the first region 121 may be approximately the entire surface of the electrode conductor 12a on the side where the negative electrode active material layer 12b is located, excluding the exposed portion 12e.
  • the second area 122 is an area to which the connection terminal 22 can be electrically connected.
  • the second region 122 is a part of the surface on the side where the negative electrode active material layer 12b is located, above the exposed portion 12e.
  • the surface of the electrode conductor 12a on the side where the negative electrode active material layer 12b is located is simply referred to as the surface of the electrode conductor 12a.
  • a resistance section 123 is arranged between the first region 121 and the second region 122 on the surface of the electrode conductor 12a. That is, the electrode body 14 includes a resistance section 123.
  • the resistance portion 123 has a linear shape when the electrode conductor 12a is viewed from above.
  • a linear shape is a shape that has a length and width that can be substantially considered as a line.
  • the resistance portion 123 exhibits higher resistance than the first region 121 with respect to movement of the electrolytic solution contained in the negative electrode active material layer 12b along the surface of the electrode conductor 12a.
  • the resistance portion 123 is located closer to the second region 122 than the first region 121 of the electrode conductor 12a.
  • the width of the linear resistance portion 123 may be 20 ⁇ m or more, for example, 50 ⁇ m.
  • the resistance portion 123 may be located on any path along which the electrolyte moves from the first region 121 to the second region 122 on the surface of the electrode conductor 12a.
  • the resistor portion 123 is an exposed portion in the left-right direction when the direction from the first region 121 to the second region 122 is defined as the front on the first region 121 side than the second region 122. It may be arranged between both ends of 12e. In this case, the resistance section 123 will be present on the path, no matter what path the electrolytic solution takes to move from the first region 121 to the second region 122.
  • the resistance portion 123 By arranging the resistance portion 123 in this manner, the resistance to movement of the electrolyte from the first region 121 to the second region 122 can be increased regardless of the movement path of the electrolyte.
  • the resistance portion 123 may be spaced apart from the end of the first region 121 facing the second region 122 by 3 mm or more.
  • the resistance section 123 does not have to be located on all the paths through which the electrolytic solution can move from the first region 121 to the second region 122. That is, the resistance portion 123 may be located on at least a portion of the path along which the electrolytic solution moves from the first region 121 to the second region 122. With the resistance section 123 positioned in this manner, the resistance to movement of the electrolytic solution increases in the path where the resistance section 123 is present.
  • the resistance section 123 does not necessarily have to be a separate region from the second region 122, and may be included in the second region 122. In that case, the resistance portion 123 may exhibit higher resistance than the second region 122 with respect to movement of the electrolytic solution included in the negative electrode active material layer 12b along the surface of the electrode conductor 12a.
  • FIG. 7 is a diagram showing the movement of the electrolyte in the electrode conductor 12a of the negative electrode 12 that does not include the resistance section 123.
  • movement of the electrolyte from the first region 121 side to the second region 122 side is shown for each time for four examples of the negative electrode 12.
  • Reference numeral 701 in FIG. 7 is an image showing the state immediately after forming the negative electrode active material layer 12b.
  • Reference numeral 702 in FIG. 7 is an image showing a state one hour has passed since the state shown by reference numeral 701.
  • Reference numeral 703 in FIG. 7 is an image showing a state 4 hours have passed since the state shown by reference numeral 701.
  • Reference numeral 704 in FIG. 7 is an image showing a state 12 hours have passed since the state shown by reference numeral 701.
  • FIG. 8 is a diagram showing an example of a cross section of the electrode conductor 12a.
  • reference numeral 801 is a photograph of a wide range of the cross section of the electrode conductor 12a, including the resistance portion 123, and a portion of the first region 121 and a portion of the second region 122 located on both sides thereof.
  • reference numeral 802 is an enlarged view of region R1 in reference numeral 801.
  • reference numeral 803 is an enlarged view of region R2 in reference numeral 801.
  • reference numeral 804 is an enlarged view of region R3 in reference numeral 801.
  • the region R1 is a region of the first region 121 that is separated from the resistance section 123.
  • Region R2 is a region between first region 121 and resistance section 123.
  • Region R3 is a region including resistance section 123.
  • the surface of the electrode conductor 12a in the first region 121 is processed (roughened) to have a rough surface in order to facilitate coating of the negative electrode active material 12c, etc. has been done.
  • the thickness of the electrode conductor 12a may be 5 ⁇ m to 25 ⁇ m.
  • the arithmetic mean roughness Ra on the surface of the electrode conductor 12a may be 0.15 ⁇ m to 0.6 ⁇ m.
  • the maximum height Rz on the surface of the electrode conductor 12a may be 1.2 ⁇ m to 5 ⁇ m.
  • the surface of the electrode conductor 12a is processed so that the surface roughness is increased even in the region R2.
  • the resistance portion 123 may include a region on the surface of the electrode conductor 12a that has a smaller surface roughness than the first region 121. Since the resistance section 123 includes such a region, the influence of capillary phenomenon is reduced in the resistance section 123. Therefore, the resistance portion 123 exhibits higher resistance than the first region 121 with respect to movement of the electrolytic solution along the surface of the electrode conductor 12a. That is, in a region of the resistance portion 123 where the surface roughness is smaller than that of the first region 121, the electrolytic solution contained in the negative electrode active material layer 12b is difficult to move toward the second region 122 side.
  • a region of the resistance portion 123 whose surface roughness is smaller than that of the first region 121 will be referred to as a reduced roughness region.
  • the entire resistance portion 123 may be a reduced roughness region, or only a portion of the resistance portion 123 may be a reduced roughness region.
  • the portions of the resistance portion 123 other than the reduced roughness region have a resistance to movement of the electrolyte that is higher than that of the first region 121. It may have another configuration.
  • the portion of the resistance portion 123 other than the roughness reduction region may have, for example, a configuration described in a modification described later.
  • the arithmetic mean roughness Ra in the roughness reduction region may be, for example, 0.05 ⁇ m to 0.1 ⁇ m. Further, the maximum height Rz in the reduced roughness region may be 0.3 ⁇ m to 1.0 ⁇ m. When the roughness reduction region has such roughness, the resistance of the electrolytic solution in the resistance portion 123 to movement along the surface of the electrode conductor 12a becomes sufficiently high.
  • the thickness of the electrode conductor 12a may vary. Specifically, the thickness of the electrode conductor 12a in the reduced roughness region may become smaller. As the thickness of the electrode conductor 12a becomes smaller, the strength of the electrode conductor 12a decreases.
  • the thickness of the electrode conductor 12a in the reduced roughness region changes, a difference occurs between the thickness of the electrode conductor 12a in the first region 121 and the thickness of the electrode conductor 12a in the reduced roughness region.
  • the difference between the thickness of the electrode conductor 12a in the first region 121 and the thickness of the electrode conductor 12a in the reduced roughness region may be 20% or less of the thickness of the electrode conductor 12a in the first region 121.
  • the thickness of the electrode conductor 12a in the reduced roughness region does not need to vary. In that case, the difference between the thickness of the electrode conductor 12a in the first region 121 and the thickness of the electrode conductor 12a in the reduced roughness region is 0% of the thickness of the electrode conductor 12a in the first region 121.
  • the variation in thickness during the process of providing the reduced roughness region on the surface of the electrode conductor 12a may be 20% or less of the thickness of the electrode conductor 12a in the first region 121. This can reduce the decrease in strength of the electrode conductor 12a in the reduced roughness region.
  • Such a reduced roughness region may be provided, for example, by pressing the surface of the electrode conductor 12a using a roller or the like.
  • the electrode conductor 12a may be bent in a convex manner in the resistance portion 123 on the opposite side from the surface of the electrode conductor 12a. Since the electrode conductor 12a has such a shape, the resistance portion 123 functions as a pool of electrolyte solution. That is, the electrolyte becomes difficult to move from the resistance section 123 to the outside. Therefore, the resistance of the resistance section 123 against movement of the electrolytic solution can be further increased.
  • the negative electrode 12 includes the resistance portion 123, thereby reducing the movement of the electrolyte from the first region 121 to the second region 122 on the surface of the electrode conductor 12a. Therefore, according to the electrode body 14, there is a possibility that a connection failure between the connection terminal 22 welded to the second region 122 and the electrode conductor 12a may occur due to the electrolyte adhering to the second region 122. can be reduced.
  • the electrode body 14 includes the resistance portion 123 on the surface of the electrode conductor 12a.
  • the electrode body 14 may also include the resistance portion 123 on the surface of the electrode conductor 11a.
  • the influence of capillarity on the movement of the electrolyte increases also on the surface of the electrode conductor 11a. That is, the electrolytic solution can reach the second region 122 on the surface of the electrode conductor 11a.
  • the electrode body 14 includes the resistance portion 123 on the surface of the electrode conductor 11a, movement of the electrolyte can be reduced even in the electrode conductor 11a whose surface is roughened.
  • FIG. 9 is a cross-sectional view schematically showing a resistance section 123A according to a first modification example of the resistance section 123.
  • the resistance portion 123A may be a recessed portion on the surface of the electrode conductor 12a.
  • the resistance portion 123A functions as a reservoir of electrolyte solution. Therefore, such a resistance portion 123A also exhibits higher resistance than the first region 121 with respect to movement of the electrolytic solution along the surface of the electrode conductor 12a.
  • the resistance portion 123A may be provided by excavating the surface of the electrode conductor 12a using a laser, for example.
  • the depth of the resistance portion 123A may be 0.5 ⁇ m or more.
  • the difference between the thickness of the electrode conductor 12a in the first region 121 and the thickness of the electrode conductor 12a in the resistance portion 123A may be 20% or less of the thickness of the electrode conductor 12a in the first region 121. Further, the vicinity of the resistance portion 123A may be more raised than other regions of the electrode conductor 12a. In other words, the thickness of the first region 121 and the second region 122 that are in the immediate vicinity of the resistance portion 123A may be thicker than the thickness of the electrode conductor 12a in the first region 121 that is spaced apart from the resistance portion 123A.
  • the bottom or at least one side of the resistance portion 123A may have a smaller surface roughness than the first region 121. Since the bottom or side portions of the resistance portion 123A have such surface roughness, the resistance portion 123A exhibits higher resistance to movement of the electrolytic solution along the surface of the electrode conductor 12a. Therefore, the possibility of a poor connection between the connection terminal 22 and the electrode conductor 12a can be further reduced.
  • the specific surface roughness of the bottom or side portion is the same as the surface roughness of the roughness reduction region described above. It may be.
  • the bottom portion or at least one side portion of the resistance portion 123A may include a void portion inside the surface thereof.
  • the void portion may be formed by taking in air around the portion in the process of cooling the portion heated by the laser, or by deformation due to expansion and contraction of the electrode conductor 12a. It is formed.
  • a further recess may be formed on the surface of the electrode conductor 12a at the bottom or at least one side of the resistance portion 123A.
  • FIG. 10 is a cross-sectional view schematically showing a resistance section 123B according to a second modification example of the resistance section 123.
  • the resistance portion 123B may be a thick member located on the surface of the electrode conductor 12a and separate from the electrode conductor 12a. In this case, the resistance portion 123B blocks the movement of the electrolytic solution along the surface of the electrode conductor 12a, thereby exhibiting a higher resistance than the first region 121 against the movement.
  • the material constituting the resistance portion 123B in this modification may be any material as long as it can be liquid-tightly bonded to the surface of the electrode conductor 12a and does not allow the electrolyte to penetrate.
  • a specific example of the material constituting the resistance portion 123B is styrene-butadiene rubber.
  • FIG. 11 is a plan view showing a modification of the unit cell 10 including the negative electrode 12.
  • the resistance portion 123 includes a region (roughness reduced region) having a smaller surface roughness than the first region 121 .
  • the first housing body 15 may house the electrode body 14. At this time, the exposed portion 12e of the electrode conductor 12a protrudes from the first container 15. Furthermore, as described above, the first housing body 15 may have its peripheral edge sealed while housing the electrode body 14 therein. In the following description, the portion where the first container 15 is sealed along the side of the first container 15 from which the exposed portion 12e protrudes will be referred to as a sealed portion 151.
  • the position of the sealing part 151 is not particularly limited, and may be located between the first region 121 and the resistance part 123, for example.
  • the sealing part 151 may be located on the resistance part 123.
  • the degree of adhesion of the sealing part 151 to the reduced roughness area included in the resistance part 123 is higher than the degree of adhesion of the sealing part 151 to areas other than the reduced roughness area.
  • the sealing part 151 is in close contact with the surface of the electrode conductor 12a, so that resistance to the movement of the electrolyte along the surface of the electrode conductor 12a is reduced. higher than without it.
  • the resistance of the resistance portion 123 to the movement of the electrolyte along the surface of the electrode conductor 12a is lower than that in the case where the sealing portion 151 is not located in the resistance portion 123. , can be even higher.
  • connection terminal 22 and the electrode conductor are welded to the second region 122 due to the electrolyte adhering to the second region 122.
  • the possibility that a connection failure with 12a will occur can be reduced. Therefore, the possibility that defective secondary batteries 1 will occur can be reduced. Therefore, the energy and resources consumed in manufacturing defective secondary batteries 1 can be saved, thereby contributing to the achievement of Sustainable Development Goals (SDGs).
  • SDGs Sustainable Development Goals
  • Unit cell (electricity storage element) 11a Electrode conductor 11b Positive electrode active material layer (electrode active material layer) 11c Positive electrode active material (electrode active material) 12a Electrode conductor 12b Negative electrode active material layer (electrode active material layer) 12c Negative electrode active material (electrode active material) 121 First region 122 Second region 123 Resistance section 14 Electrode body 15 First container (container) 151 Sealing part

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

Corps d'électrode (14) qui comprend : une couche de matériau actif comprenant un matériau actif d'électrode et une solution électrolytique ; un conducteur d'électrode (12a) ayant (i) une première région (121) où la couche de matériau actif est située et (ii) une seconde région (122) qui est une région différente de la première région et qui est une région à laquelle une borne de connexion peut être connectée électriquement ; et une partie résistive (123) située plus près de la seconde région que de la première région du conducteur d'électrode et présentant une résistance plus élevée que la première région à un mouvement de la solution électrolytique le long de la surface du conducteur d'électrode.
PCT/JP2022/015440 2022-03-29 2022-03-29 Corps d'électrode et élément de stockage d'énergie WO2023187982A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564023B2 (fr) * 1974-09-20 1981-01-28
JPS6093755A (ja) * 1983-10-26 1985-05-25 Matsushita Electric Ind Co Ltd 有機電解液電池の製造法
WO2016063925A1 (fr) * 2014-10-23 2016-04-28 国立研究開発法人産業技術総合研究所 Structure de cellule de production d'énergie plane, groupement de structures de cellule de production d'énergie l'utilisant, dispositif de micro-production d'énergie et leur procédé de fabrication
JP2020047509A (ja) * 2018-09-20 2020-03-26 株式会社豊田自動織機 バイポーラ電極の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS564023B2 (fr) * 1974-09-20 1981-01-28
JPS6093755A (ja) * 1983-10-26 1985-05-25 Matsushita Electric Ind Co Ltd 有機電解液電池の製造法
WO2016063925A1 (fr) * 2014-10-23 2016-04-28 国立研究開発法人産業技術総合研究所 Structure de cellule de production d'énergie plane, groupement de structures de cellule de production d'énergie l'utilisant, dispositif de micro-production d'énergie et leur procédé de fabrication
JP2020047509A (ja) * 2018-09-20 2020-03-26 株式会社豊田自動織機 バイポーラ電極の製造方法

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